markgojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Tapered Links</title>
<meta name="description" content="A Link class using a custom tapered geometry." />
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;
myDiagram =
$(go.Diagram, "myDiagramDiv", // the ID of the DIV HTML element
{
initialContentAlignment: go.Spot.Center,
layout: $(go.ForceDirectedLayout),
"undoManager.isEnabled": true
});
// This controls whether links overlap each other at each side of the node,
// or if the links are spread out on each side of the node.
var SPREADLINKS = true; // must be set before defining templates!
myDiagram.nodeTemplate =
$(go.Node, go.Panel.Auto,
{ locationSpot: go.Spot.Center },
$(go.Shape,
{
figure: "RoundedRectangle",
parameter1: 10,
fill: "orange", // default fill color
portId: "",
fromLinkable: true,
fromSpot: (SPREADLINKS ? go.Spot.AllSides : go.Spot.None),
toLinkable: true,
toSpot: (SPREADLINKS ? go.Spot.AllSides : go.Spot.None),
cursor: "pointer"
},
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 10, font: "bold 12pt sans-serif" },
new go.Binding("text"))
);
myDiagram.linkTemplate =
$(TaperedLink, // subclass of Link, defined below
go.Link.Bezier,
(SPREADLINKS ? go.Link.None : go.Link.Orthogonal),
{
fromEndSegmentLength: (SPREADLINKS ? 50 : 1),
toEndSegmentLength: (SPREADLINKS ? 50 : 1),
relinkableFrom: true,
relinkableTo: true
},
$(go.Shape,
{ stroke: null, strokeWidth: 0 },
new go.Binding("fill", "color"))
);
// create a few nodes and links
myDiagram.model = new go.GraphLinksModel([
{ key: 1, text: "one", color: "lightyellow" },
{ key: 2, text: "two", color: "brown" },
{ key: 3, text: "three", color: "green" },
{ key: 4, text: "four", color: "slateblue" },
{ key: 5, text: "five", color: "aquamarine" },
{ key: 6, text: "six", color: "lightgreen" },
{ key: 7, text: "seven" }
], [
{ from: 5, to: 6, color: "orange" },
{ from: 1, to: 2, color: "red" },
{ from: 1, to: 3, color: "blue" },
{ from: 1, to: 4, color: "goldenrod" },
{ from: 2, to: 5, color: "fuchsia" },
{ from: 3, to: 5, color: "green" },
{ from: 4, to: 5, color: "black" },
{ from: 6, to: 7 }
]);
}
function TaperedLink() {
go.Link.call(this);
}
go.Diagram.inherit(TaperedLink, go.Link);
// produce a Geometry from the Link's route
/** @override */
TaperedLink.prototype.makeGeometry = function() {
// maybe use the standard geometry for this route, instead?
var numpts = this.pointsCount;
if (numpts < 4 || this.computeCurve() !== go.Link.Bezier) {
return go.Link.prototype.makeGeometry.call(this);
}
var p0 = this.getPoint(0);
var p1 = this.getPoint((numpts > 4) ? 2 : 1);
var p2 = this.getPoint((numpts > 4) ? numpts - 3 : 2);
var p3 = this.getPoint(numpts - 1);
var fromHoriz = Math.abs(p0.y - p1.y) < Math.abs(p0.x - p1.x);
var toHoriz = Math.abs(p2.y - p3.y) < Math.abs(p2.x - p3.x);
var p0x = p0.x + (fromHoriz ? 0 : -4);
var p0y = p0.y + (fromHoriz ? -4 : 0);
var p1x = p1.x + (fromHoriz ? 0 : -3);
var p1y = p1.y + (fromHoriz ? -3 : 0);
var p2x = p2.x + (toHoriz ? 0 : -2);
var p2y = p2.y + (toHoriz ? -2 : 0);
var p3x = p3.x + (toHoriz ? 0 : -1);
var p3y = p3.y + (toHoriz ? -1 : 0);
var fig = new go.PathFigure(p0x, p0y, true); // filled
fig.add(new go.PathSegment(go.PathSegment.Bezier, p3x, p3y, p1x, p1y, p2x, p2y));
p0x = p0.x + (fromHoriz ? 0 : 4);
p0y = p0.y + (fromHoriz ? 4 : 0);
p1x = p1.x + (fromHoriz ? 0 : 3);
p1y = p1.y + (fromHoriz ? 3 : 0);
p2x = p2.x + (toHoriz ? 0 : 2);
p2y = p2.y + (toHoriz ? 2 : 0);
p3x = p3.x + (toHoriz ? 0 : 1);
p3y = p3.y + (toHoriz ? 1: 0);
fig.add(new go.PathSegment(go.PathSegment.Line, p3x, p3y));
fig.add(new go.PathSegment(go.PathSegment.Bezier, p0x, p0y, p2x, p2y, p1x, p1y).close());
var geo = new go.Geometry();
geo.add(fig);
geo.normalize();
return geo;
};
// end TaperedLink class
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:700px; min-width: 200px"></div>
<p>
This sample demonstrates customization of the <a>Link</a> <a>Shape</a>'s <a>Geometry</a>.
</p>
<p>
The TaperedLink class in this sample inherits from Link and overrides the makeGeometry method.
For Bezier-curve Links, this computes a Geometry that is thick at the "from" end and thin at the "to" end.
The implementation is very simple and does not account for links that
are coming out from a node at angles that are not a multiple of 90 degrees.
</p>
</div>
</body>
</html>